On Thu, 18 Feb 2010, James Bottomley wrote: > On Thu, 2010-02-18 at 14:16 +0530, Ramya Desai wrote: > > On Wed, Feb 17, 2010 at 8:32 PM, James Bottomley > > <James.Bottomley@xxxxxxx> wrote: > > > > > I have no idea what the MS driver is, so it's impossible to answer > > > specifically. > > > > MS means mass storage driver only. > > OK, still don't know what that is ... but Randy decoded this for me; he > said you mean a driver under drivers/usb/storage? Yes, Ramya is talking about usb-storage. > In that case, it looks like the helpers in protocol.c do use chaining > correctly (as long as the driver isn't doing direct dma), but there's a > clamp on the sg table size in scsiglue.c: > > .sg_tablesize = SG_ALL > > That would have to be changed to SCSI_MAX_SG_CHAIN_SEGMENTS to enable > chaining. Is there any reason not to make this change in the standard kernel? I believe that the subdrivers which don't use the helpers in protocol.c also handle chaining correctly. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
